家蚕滞育分子机制的研究

Studies on the Molecular Mechanism of Diapause in the Silkworm,Bombyx mori

简述了有关家蚕滞育机制的分子生物学研究进展。家蚕的胚胎滞育是由环境条件和遗传性支配的。二化性蚕品种在胚胎中期和晚期经受高温和长光照 ,其结果是下一代胚胎滞育。不同的环境信息被神经分泌细胞“解读”和“受纳”。在特定的环境条件信息下 ,神经分泌细胞产生和分泌滞育激素 (DH)。滞育激素进入卵内 ,调节和建立滞育卵专一的内部环境。其特征是 ,滞育卵中发生有关糖原和山梨醇转换的一系列酶促反应 ,从而实现进入滞育、解除滞育等生理过程。

Embryonic diapause of the silkworm, Bombyx mori ,is controlled by both enviromental factors and inheritance.Exposure to high temperature and long illumination at the middle to late embryonic stages results in an embryonic diapause in the next generation.Different enviromental informations are readed and accepted by neuroendocrine cells.Under specific enviromental information,neuroendocrine cells produce and secrete diapause hormone(DH).DH enters into eggs,which regulates and builds internal enviroment for specific diapause eggs.The characteristics are showed through a series of reaction for changes of glycogen and sorbitol in the diapause eggs to complete the physiological process of entry and termination of diapause.This paper briefly introduces advances on the molecular biological researches of diapause mechanism in the silkworm, Bombyx mori.